Padlock



N. KROHN.

PADLOCK.

APPLICATION FILED MAY I7. 1919.

Patented Aug. 10, 1920..

' i I Ina/endan- 44 i; rmvz y I I UNITED STATES PATENT OFFICE.

NELS KROI-IN, OF CHICAGO, ILLINOIS, ASSIGNOR TO. THE ADAMS 81; WESTLAKECOMPANY, A CORPORATION OF ILLINOIS.

V PADLOCK.

Specification of Letters Patent.

Patented Aug. 10, 1920.

Application filed May 17, 1919. Serial No. 297,751.

To all whom it may concern:

Be it known that I, NELS l'moHN, a citizen of the United States, andresident of Chicago, county of Cook, and State of Illinois, haveinvented certain new and useful Improvements in Padlocks, of which thefollowing is a specification, and which are illustrated in theaccompanying drawings, forming a part thereof.

The invention relates to padlocks espe cially adapted for use inconnection with switch mechanism for railroads; its objects being toprovide a lock which shall be reliable in action and difficult to bereleased except by means of a specially designed key.

In railroad practice it is essential that switches be securely lockedagainst dishonest persons who may .seek to throw the switch against anapproaching train for the purpose of disabling it. It has been'foundthat many of the locks in common use may be opened by a blow from ahammer or similar implement, such blow, if skilfully delivered, causingthe retraction of the bolt. While many efiorts have been made to producea lock which shall be safe against such tampering, they have not beenentirely successful.

The present invention consists of a lock organized substantially ashereinafter described and as illustrated in the accompanying drawings,in which Fi'gurel is a face elevation of the lock;

Fig. 2 is a'view ofthe lock with the face plate removed, the shacklebeing closed;

Fig. 3 is a similar view, the shackle beingopen;- v

Fig. 4: is a sectional View on the line 14 of Fig. 3;

Fig. 5 is a view in perspective of the bolt; and

Fig. 6 is a view in perspective of the key adapted to open the lock.

The shell or casing 10 of the lock is of ordinary form, and is providedwith a face plate 11 permanently secured thereto by means of suitablerivets, as 12. The shackle 13 is of the usual arch form and is pivotedat 1A between a pair of lugs, as 15, upstanding from the side faces ofthe shell and between which there is an aperture 16, into which aportion of the hub of the shackle enters.

The shell isalso provided with asuitable aperture to receive the nose 17of the shackle,

which is provided with an aperture 18 to receive the locking bolt 19.The bolt 19 is advanced by means of a suitable spring 20, here shown ascoiled about a post 12 which serves as one of the rivets for securingthe face plate as described. The rear end of the bolt extends below thehub of the shackle, and is provided with a flattened upper face 21 forengaging a flattened portion 22 of the hub when the shackle is closed.The lower margin 23 of the rear portion of the bolt has a straight faceparallel to the flattened portion 22 and bearing against a fixed post24, the rear end of the bolt being thus rigidly held against vibrationbetween the shackle hub and the post 24 when the shackle is closed.

A wing 25, depending from the body portion of the bolt, is provided witha curved shoulder 26 for engagement by the key for the purpose ofretraction. A stem 27 projecting forwardly from the wing 25, underlies apost 28 upon which the forward end of the bolt rides and .is guided. Therearward end of the stem 27 is provided with a shoulder 29, projectinglaterally from the wing 25, and adapted to be engaged by aspringadvanced latch 30 pivoted on the post 24c. The rearward end of thelatch 30 is provided with a downwardly projecting toe 81, against whichbears a spring 32 for holding the latch in engagement with the shoulder29. The springs 20 and 32 may be conveniently formed, as shown, of asingle piece of wire coiled about'the post 12.

A securing latch 33 is pivotally attached to the latch 30, and engagesas a hook a post 3d, being urged into such engaging position by means ofa spring 35, coiled about the post 3d and bearing upon a stud 36 securedto the latch.

The shackle is spring-retracted, there being shown for this purpose aspring 37, coiled about a post 38, one end thereof bearing against theend of the shackle nose and the other against the edge wall of theshell. A key post is shown at 39, and may be surrounded by an upstandingannular flange 40, to prevent the insertion of a key not properlyconfigured to receive it. A suitable aperture 4.1 is formed in the faceplate 11 to receive the key 42. This key is provided with suitable wards43 for engaging the latches and 30 and the shoulder 26 of the bolt 19.

In its initial turning movement the key raised out of engagement withthe bolt shoulder 29, thereby bringing the hook of the latch 33 abovethe post 34, as shown in Fig. 3. Further movement ofthe'key causes itsengagement with the shoulder 26 of the bolt, withdrawing the latteragainst the resistance of thespring 20, releasing the shackle andpermitting its ejection by the spring 37. The flattened face 22' of theshackle hub swings into a recess 44 formed in the upper face of the boltin advance of its flattened portion" 21, and prevents the advance of thebolt until the shackle is again closed. 'A depending lug 4L5. ispreferably formed'on the hub of the shackle to overlie the bolt and holdit against lateral vibration. V Inasmuch as it is essential that thelatch 33 be held in retracted position until the latch 30is raised, andboth of these latches must be held in withdrawn positions until the boltis retracted, the releasing of the look by any instrument other than aproperly fitting key is rendered exceedingly diflicult.

The release of the look by jars, as by the blow of a hammer, is renderedpractically impossible because the parts to be released move in threedifferent directions. Furthermore, to release the look by a blow wouldinvolve simultaneous movement of the several parts, which is impossibleas the latch 30. must necessarily move in advance of the bolt. If thelatch 33 were jarred out of en- 'gagement with the post 34, the latch 30would still be held in engagement with the shoulder 29, and before itsdisengage ment could be elfected the latch 33 would have been returnedinto engagement with the post by the action of the spring 35.

IVhile I have shown a preferred and eflicient form of construction,various changes of detail might be made without departing i from thescope of the invention.

I claim as my invention 1. In a padlock, in combination, an oscillatingshackle, a reciprocating spring-advanced bolt for securing the shackle,means movable in the arc of a circle transversely to the path of thebolt for holding the bolt inadvanced position, and key-releasable meansfor securing the last-named means in engagement with the bolt. 7 V

:2. In a padlock, in combination, an oscillating shackle, areciprocating spring-advanced bolt for securing the shackle,springadvanced means movable in the arc of a circle transversely to thepath of the bolt for holding the bolt in advanced position, andkey-releasable means carried by the last-named means for securing thesame in engagement with the bolt.

3. In a padlock, in combination, an oscillating shackle, a reciprocatingspring-advanced bolt for securing the shackle, springadvanced and keyretracted means movable transversely to the path of the bolt forholdlating shackle, a reciprocating spring-ad vanced bolt for securingthe shackle, means movable transversely to the path of the bolt forholding the bolt in advanced position, a spring-advanced key-retractedlatch carried by such means, and a fixed keeperfor the latch. I

*5. In a padlock, in combination, an oscillating shackle, areciprocating spring-advanced bolt for securing the shackle, a

spring-advanced oscillating latch adapted to engage back of a shoulderonthe bolt and movable transversely of the path, of the bolt, akey-releasable latchv pivotally carried by the previously named latchand movable transversely to the path thereof, and a fixed keeper. forthe last-named latch.

6. In a padlock, in combination, an oscillating shackle, a reciprocatingspring-advanced bolt for securing the shackle, a

spring-advanced key-retracted oscillating latch adapted to engageback ofa shoulder on the bolt and movable transversely to the path of the bolt,a key-releasable latch pivotally carried by the previously named latchand movable transversely to the path thereof, and a fixed keeper forthelastnamed latch. 7. In a padlock, in combination, an oscillatingshackle, a reciprocating spring-advanced bolt for securing the shackleand being held in retracted position by the shackle when the latter isopen, means movable transversely to the path of the ,bolt for holdingthe bolt in advanced position, and key-releasable means for securing thelbaslt-named means in engagement with the 8. In a padlock, incombination, an oscillating shackle, a reciprocating bolt for securingthe shackle, means movable in the arc of a circle transversely into andout of the path of the bolt for holding the bolt in advanced position,and key-releasable means for securing'the last-named means in engagementwith the bolt. 7

9. In a padlock, in combination, an operable shackle, a movable bolt forsecuring the shackle, means movable in the arc of a circle transverselyinto and out of the path of the bolt for holding the bolt'in advancedposition, and key-releasable means for securing the last-named means inengagement with the bolt.

cillating shackle, and three cooperating ele ments for securing theshackle in closed position, all of such three elements being movable indifferent directions for releasing the shackle, two of said elementsbeing oscillatable.

11. In a padlock, in combination, an OS- cillating shackle, a movablebolt for securing the shackle, and a lug projecting from the hub of theshackle and overlying the bolt to prevent lateral movement thereof.

12. In a padlock, in combination, a casing, a shackle pivoted to saidcasing, a bolt guiding post and a spring receiving post located onopposite sides of the closed position of the nose of said shackle, ashackle expelling spring coiled about said spring receiving post actingin substantially the line of movement of the nose 'of the shackle toexpel the same, and limited in its movement by said bolt guiding post.

13. In a padlock, in combination, a casing, a shackle pivoted to saidcasing, a hub on said shackle concentric with its pivot, said hub havinga flattened portion, a spring advanced reciprocable bolt in said casinghaving a portion adapted to contact with said flattened portion when theshackle is closed to lock the shackle and a recess into which a portionof the hub adjacent its flattened portion may swing when the bolt isretracted, engagement of the hub with the wall of said recessmaintaining the bolt in its retracted position.

14. In a padlock, in combination, an oscillating shackle, areciprocating bolt for securing the shackle, means movable in the arc ofa circle transversely into and out of the path of the bolt for holdingthe bolt in advanced position, a spring urging said means toward thepath of the bolt, and key-releasable means for securing the last-namedmeans in engagement with the bolt.

15. In a padlock, in combination, an operable shackle, a movable boltfor securing the shackle, means movable in the arc of a circletransversely into and out of the path of the bolt for holding the boltin advanced position, a spring urging said means toward the path of thebolt,- and key-releasable means for securing the last-named means inengagement with the bolt.

16. In a padlock, in combination, an operable shackle, a movable boltfor securing the shackle, means movable in the arc of a circletransversely into and out of the path of the bolt for holding the boltin advanced position, and key-releasable means for positively securingthe last-named means in engagement with the bolt.

NELS KROHN.

